APA

Nelsen O. E., . (1953). Comparative embryology of the vertebrates: with 2057 drawings and photographs grouped as 380 illus. New York: Blakiston.

Chicago

Nelsen Olin Everett, . 1953. Comparative embryology of the vertebrates: with 2057 drawings and photographs grouped as 380 illus. New York: Blakiston.

Harvard

Nelsen O. E., . (1953). Comparative embryology of the vertebrates: with 2057 drawings and photographs grouped as 380 illus. New York: Blakiston.

MLA

Nelsen Olin Everett, . Comparative embryology of the vertebrates: with 2057 drawings and photographs grouped as 380 illus. New York: Blakiston. 1953.